Definition: In this task, you are given an input list A comprising of numbers and alphabets. You need to extract and sort the unique alphabets in the list. The alphabets in the input list will only be in lowercase. Return -1 if there is no alphabet in the input list.
Input: ['7313', 'x', 's', '5651', '8361', 'c', 'z', '2657', 'j']

c, j, s, x, z